<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        li {
            list-style: none;
            width: 200px;
            height: 100px;
            text-align: center;
            line-height: 100px;
        }
        ul{
            display: flex;
            width: 800px;
            height: 100px;
        }
        .item {
            background-color: rgb(225, 108, 57);
        }
        .item2 {
            background-color: rgb(67, 220, 143);
        }
        .item3 {
            background-color: rgb(83, 192, 238);
        }
    </style>
</head>
<body>
    <ul>
        <li class="item">1</li>
        <li class="item2">2</li>
        <li class="item3">3</li>
    </ul>
</body>
</html>